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	free resource	PubMed Central	https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21483461/
	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/21483461
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	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1038/ajg.2011.130